Dear Sir/Madam,
                        I am a student. working on ODE. While changing my simulation robot and executing, i am facing an error. i tried to work on it but i don't know how to solve this issue. i hope you may guide me with it. 
The error image is attached with this email.
Thanks
Waiting for your response. 


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Kind Regards:
 
Sehar Shahzad Farooq